Grease lubrication device and method for spherical hinge joint of wobble plate type oil-free compressor

Abstract

The invention discloses a grease lubrication device and method for a spherical hinge joint of a wobble plate type oil-free compressor. According to the grease lubrication device, a grease storage space is machined in a cavity of a wobble plate, a pre-tightening spring limited by a pressing plate is arranged above the grease storage space, and a grease adding device extending into an inner cavity of the grease storage space is installed in the middle of the wobble plate; a plurality of joint ball sockets for placing the spherical hinge joints are distributed on the swing disc, and the spherical hinge joints are wrapped and sealed on the swing disc through spherical hinge joint rubber sleeves; lubricating grease is injected into the grease storage space through the grease adding device, the lubricating grease is conveyed in a wriggling mode under the action of the pre-tightening spring, and the spherical hinge joint with the connecting rod achieves rolling and sliding lubrication in the joint ball socket. And lubricating grease is prevented from splashing under the sealing action of the spherical hinge joint rubber sleeve. The problem of lubricating grease loss or non-uniformity caused by continuous movement of the spherical hinge joint is solved, the lubricating grease of the spherical hinge joint is kept, and lubricating grease loss and internal pollution of a machine caused by splashing of the lubricating grease are prevented.

Description

Technical Field

[0001] The present invention relates to the lubrication field of the ball hinge joint of a swash plate compressor, and particularly to a grease lubrication device and method for the ball hinge joint of a swash plate oil-free compressor. Background Art

[0002] A swash plate compressor is a compact compressor that realizes the compression of gas in a cylinder through the periodic swing of a swash plate and drives a connecting rod and a piston to reciprocate periodically through a ball hinge structure on the swash plate. It is widely used in the fields of automotive air conditioning, refrigeration, and gas compression.

[0003] With the expansion of the application field of compressors and the requirement for the cleanliness of the compressed medium, the market demand for clean oil-free compressed air sources has increased sharply. During the operation of an oil-free lubrication compressor, the compressed gas discharged does not contain oil and gas, and has a high cleanliness, which is deeply welcomed by users. Although the oil-free lubrication compressor does not use liquid lubricating oil, a solid lubricating grease is pre-filled in moving parts (such as inside bearings) to maintain the lubrication characteristics of the moving parts. However, due to the temperature rise during long-term operation, the grease will evaporate and oxidize and decompose, and the thickener in the grease will also gradually deteriorate and become ineffective. In addition, the grease also has a certain working life. Coupled with harsh operating conditions, all these will affect the service life of the grease, resulting in a gradual decline in the use effect of the machine. In order to extend the continuous lubrication effect and service life of the moving parts of the oil-free compressor, it is necessary to maintain sufficient grease or add new grease in time. Due to the particularity and sealing of the structure of the oil-free lubrication compressor, many parts in the machine must be disassembled, and it is very difficult to add new grease according to the usage requirements.

[0004] The patent "Swash Plate Air Compressor" (application number: 201310117585.0) encapsulates lubricating grease in the ball hinge structure and sets a sealing device at the connection of the ball hinge structure between the connecting rod and the swash plate. Although this method and device for pre-storing lubricating grease can reserve part of the lubricating grease and extend the lubrication of the ball hinge, with the continuous operation of the compressor, there are still risks of evaporation loss, oxidation decomposition of the lubricating grease, and failure of the friction pair. Therefore, in order to maintain the long-term lubrication of the ball hinge joint, the high-volume pre-storage and continuous replenishment of the lubricating grease become the key. Summary of the Invention

[0005] In order to solve the above-mentioned defects existing in the prior art, the present invention takes the swing plate and ball joint structure as the research object, takes the high-quantity pre-storage and automatic and continuous replenishment of grease as the purpose, and proposes a grease lubrication device and method for the ball joint of a swing plate type oil-free compressor. The method of pre-storing grease in the swing plate cavity and pre-storing grease in the ball joint joint rubber sleeve is adopted. When the grease is gradually lost with the movement, the grease in the swing plate cavity produces a peristaltic transport function under the action of the spring preload force, thereby maintaining the grease of the ball joint. At the same time, the wrapping and sealing function of the ball joint rubber sleeve also prevents the loss of grease and internal contamination of the machine caused by the splashing of grease.

[0006] The present invention is achieved through the following technical solutions.

[0007] One aspect of the present invention provides a grease lubrication device for a ball joint of an oil-free compressor of a swing plate type, comprising a swing plate, a grease storage space being machined in a swing plate cavity, a preload spring defined by a pressure plate being arranged above the grease storage space, and a grease adding device extending into the inner cavity of the grease storage space being installed in the middle of the swing plate; a plurality of joint ball sockets for placing ball joints are distributed on the swing plate, and the ball joints are sealed on the swing plate by being wrapped with a ball joint rubber sleeve; grease is injected into the grease storage space by the grease adding device, and the grease is caused to peristaltically transport under the action of the preload spring, so that the ball joint with a connecting rod realizes sliding lubrication in the joint ball socket; and splashing of grease is prevented under the sealing action of the ball joint rubber sleeve.

[0008] Preferably, the pressure plate includes a movable sealing pressure plate above the grease storage space and a spring pressure plate flush with the top of the swing plate, and the preload spring is connected up and down between the movable sealing pressure plate and the spring pressure plate.

[0009] Preferably, the movable sealing pressure plate can slide along the inner wall of the swing plate of the fat storage space, and the spring pressure plate is fixedly connected to the swing plate.

[0010] Preferably, the preload spring is a circumferentially distributed compression spring group, or an integral compression spring or a leaf spring.

[0011] Preferably, a grease delivery channel is distributed circumferentially in the grease storage space, and the grease delivery channel is connected to the ball joint through a small hole at the bottom of the joint ball socket.

[0012] Preferably, the diameter of the small hole at the bottom of the joint ball socket is 2%-10% of the diameter of the joint ball socket.

[0013] Preferably, the ball joint in the joint ball socket is fixed by a fixing screw and a ball joint fixer; the ball joint, the joint ball socket, the bottom of the connecting rod, the ball joint fixer and the fixing screw are all wrapped by a ball joint rubber sleeve.

[0014] Preferably, the ball joint rubber sleeve is made of rubber or polyurethane material.

[0015] On the other hand, the present invention provides a grease lubrication method for a grease lubrication device using a swash plate type oil-free compressor ball joint, including:

[0016] Swash plate assembly installation:

[0017] Install the pre-tightening spring and the grease adding device on the movable sealing pressure plate, install the movable sealing pressure plate in the grease storage space, install the spring pressure plate on the swash plate, and seal and compress the pre-tightening spring;

[0018] Apply grease to the joint ball socket, install the ball joint in the joint ball socket, and install the ball joint fixer on the swash plate with fixing screws;

[0019] Fill part of the grease into the ball joint rubber sleeve, and seal and install it on the outer swash plate of the ball joint with a connecting rod;

[0020] Grease filling:

[0021] The grease adding device gradually injects grease into the grease storage space, and transports the grease to the joint ball socket through the small holes at the bottom of the ball socket via the grease transport channel. At the same time, the pre-tightening spring at the upper part of the grease storage space is compressed, and the grease injection is completed after reaching a certain pressure;

[0022] Compressor operation:

[0023] After the compressor runs, the ball joint keeps moving. The pre-tightening spring compresses the grease storage space through the movable sealing pressure plate, causing the grease to generate peristaltic transport, and transports the grease to the joint ball socket and the ball joint through the transport device channel and the small holes at the bottom of the joint ball socket, maintaining continuous lubrication of the ball joint; during the swinging process of the connecting rod, the ball joint rubber sleeve can elastically deform to wrap and maintain the seal to prevent grease splashing.

[0024] Due to the above technical solutions adopted by the present invention, it has the following beneficial effects:

[0025] The present invention takes the swash plate and ball joint structure as the research object, aims at high-volume pre-storage and automatic continuous replenishment of grease, adopts various pre-storage methods of grease such as pre-storing grease in the swash plate cavity and pre-storing grease in the ball joint rubber sleeve, makes the grease generate continuous transport lubrication function under the action of the spring pre-tightening force. At the same time, the wrapping and sealing functions of the ball joint rubber sleeve also prevent grease loss and internal machine pollution caused by grease splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1 is the structural schematic diagram of the present invention;

[0028] Figure 2 is the schematic diagram of the fattening device, the storage space of the grease, the pre-tightening spring device and the grease transport channel of the present invention;

[0029] Figure 3 is the right view schematic diagram of the grease transport channel of the present invention;

[0030] Figure 4 is the partial schematic diagram of the ball joint and the ball joint rubber sleeve of the present invention.

[0031] In the figure: 1. Swing plate; 2. Ball joint; 3. Joint ball socket; 4. Ball joint rubber sleeve; 5. Connecting rod; 6. Pre-tightening spring; 7. Fattening device; 8. Movable sealing pressing plate; 9. Grease storage space; 10. Grease transport channel; 11. Spring pressing plate; 12. Ball joint fixator; 13. Fixing screw; 14. Small hole at the bottom of the joint ball socket. Specific embodiments

[0032] The following will describe the present invention in detail with reference to the drawings and specific embodiments. Here, the schematic embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0033] Refer to Figure 1 、 Figure 2 As shown, the embodiment of the present invention provides a grease lubrication device for a ball joint of a swing plate type oil-free compressor, including a swing plate 1. A grease storage space 9 is machined in the cavity of the swing plate 1. A movable sealing pressing plate 8 is arranged above the grease storage space 9. A pre-tightening spring 6 is installed in the space of the swing plate 1 above the movable sealing pressing plate 8. A spring pressing plate 11 is arranged at the top of the pre-tightening spring 6. The movable sealing pressing plate 8 can slide along the inner wall of the swing plate 1 of the grease storage space 9. The spring pressing plate 11 is fixedly connected with the swing plate 1. The pre-tightening spring can adopt a circumferentially distributed compression spring group, or an integral compression spring, a leaf spring, etc. A fattening device 7 extending from the outside of the swing plate 1 into the inner cavity is installed in the middle of the movable sealing pressing plate 8. The fattening device 7 adopts a one-way valve injection mode. A sealing cover is arranged on the fattening device 7. After the fattening is completed, the sealing cover is covered. Grease transport channels 10 are arranged at both ends of the bottom of the grease storage space 9. A joint ball socket 3 communicated with the grease transport channels 10 is arranged on the swing plate 1. A ball joint 2 with a connecting rod 5 realizes rolling and sliding in the joint ball socket 3.

[0034] Such as Figure 3As shown, the grease transport channel 10 is connected to the ball joint 2 through the small hole 14 at the bottom of the spherical socket. The aperture of the small hole 14 at the bottom of the spherical socket is 2%-10% of the diameter of the spherical socket 3. The transport direction of the grease in the grease adding device 7 is from the grease storage space 9 to the grease transport channel 10, and then to the spherical socket 3, for lubricating the ball joint 2.

[0035] As Figure 4 shown, the ball joint 2 is installed in the spherical socket 3, and the ball joint 2 is fixed by the fixing screw 13 to fix the ball joint fixer 12. Among them, the ball joint fixer 12 is in a hemispherical ring shape, used to fix the ball joint 2, and does not interfere with the movement range of the connecting rod 5. Moreover, the surface of the ball joint 2 is in contact with the grease in the ball joint rubber sleeve.

[0036] In addition, as Figure 1 and Figure 4 shown, the ball joint rubber sleeve 4 wraps the ball joint fixer 12 and the fixing screw 13 entirely. The ball joint rubber sleeve can be elastically deformed but remain sealed during the swinging process of the connecting rod, and the grease stored inside forms lubrication on the upper surface of the ball joint as the connecting rod swings.

[0037] As Figure 3 shown, it is Figure 1 a view of the cross-section along the top of the spherical socket 3. Combining Figure 1 it can be seen the grease transport process and direction. Taking the four ball joints of the swing plate as an example, the grease storage space 9 is evenly connected to the grease transport channel 10 in four directions along the swing plate 1, and the grease transport channel 10 transports the grease to the bottom of the ball joint 2 through the small hole 14 at the bottom of the spherical socket, realizing grease lubrication.

[0038] As Figure 1 、 Figure 2 、 Figure 3 shown, the present invention further provides a grease lubrication method for a ball joint, and the specific steps and processes are as follows:

[0039] Assembly and installation of the swing plate 1:

[0040] First, install the movable sealing pressing plate 8 in the grease storage space 9. The movable sealing pressing plate 8 is equipped with the pre-tightening spring 6 and the grease adding device 7 that have been installed. Then install the spring pressing plate 11 on the swing plate 1, align and install the grease adding device 7, and seal and press the pre-tightening spring 6;

[0041] Second, apply a small amount of grease in the spherical socket 3 in advance, install the four ball joints 2 in the spherical socket 3, and install the ball joint fixer 12 on the swing plate 1 with the fixing screw 12;

[0042] Finally, inject some grease into the ball joint rubber sleeve 4 and install it on the swing plate 1. The reserved stretching and compression properties of the material of the ball joint rubber sleeve 4 ensure that the ball joint rubber sleeve 4 is not torn and damaged.

[0043] Grease filling process:

[0044] The grease is gradually injected into the grease storage space 9 by the grease filling device 7, and is transported to the ball socket 3 through the small holes 14 at the bottom of the joint ball socket via the grease transport channel 10, forming a grease transport with the ball joint 2. At the same time, during the process of gradually storing grease in the grease storage space 9, as the grease is added, the pre-tightening spring 6 at the upper part of the grease storage space 9 is compressed, and the grease storage space 9 expands. After reaching a certain pressure, the grease filling process is completed. Subsequently, under the action of the pre-tightening force of the pre-tightening spring 6, the grease will generate a continuous transport and lubrication function.

[0045] When the compressor operates, due to the loss of grease or uneven distribution of grease caused by the continuous movement of the ball joint 2, the pre-tightening spring 6 compresses the grease storage space 9 through the movable sealing pressing plate 8, causing the grease to generate a peristaltic transport function. The grease is transported to the ball joint 2 and the ball socket 3 through the transport device channel 10 and the small holes 14 at the bottom of the joint ball socket, maintaining continuous lubrication of the ball joint.

[0046] On the other hand, as Figure 4 shown, the ball joint rubber sleeve 4 entirely wraps the ball joint 2, the ball socket 3, the bottom of the connecting rod 5, and the ball joint retainer 12, forming a closed and sealed space that can store grease during grease filling; when the compressor operates, the grease stored in the ball joint rubber sleeve 4 will continuously supplement the ball joint with grease as the ball joint 2 moves. At the same time, due to the wrapping and sealing functions of the ball joint rubber sleeve 4, it also prevents grease loss and internal machine contamination caused by the splashing of grease.

[0047] During the swinging process of the connecting rod 5, the ball joint rubber sleeve 4 can elastically deform but remain sealed, and the grease stored inside it forms lubrication on the surface of the ball joint 2 as the connecting rod 5 swings. The ball joint rubber sleeve 4 is generally made of elastic rubber or polymer materials such as rubber and polyurethane. The reserved stretching and compression properties of the material of the ball joint rubber sleeve 4 ensure that the ball joint rubber sleeve 4 is not torn and damaged.

[0048] In the present invention, two pre-stored grease closed spaces are set during the initial assembly and installation of the swing plate, so that a high grease storage capacity is maintained inside the device. The setting of the pre-tightening spring enables the grease in the grease storage space to continuously transport grease to the ball joint under the action of the pre-tightening force and the centrifugal force of the swing plate. At the same time, the setting of the ball joint rubber sleeve, on the one hand, maintains a continuous lubricating effect of the grease on the friction pair, and on the other hand, its sealing function also prevents grease loss and internal machine contamination caused by the splashing of grease.

[0049] The present invention is not limited to the above embodiments. Based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A grease lubrication device for a ball hinge joint of a disc-type oil-free compressor, characterized in that, It includes a swing plate (1), a grease storage space (9) is machined in the cavity of the swing plate (1), a preloading spring (6) defined by a pressure plate is arranged above the grease storage space (9), and a grease adding device (7) extending into the inner cavity of the grease storage space (9) is installed in the middle of the swing plate (1); a plurality of spherical hinge joints (2) are distributed on the swing plate (1), and the spherical hinge joints (2) are wrapped and sealed on the swing plate (1) through spherical hinge joint rubber sleeves (4); grease is injected into the grease storage space (9) through the grease adding device (7), and under the action of the preloading spring (6), the grease generates peristaltic transport, and the spherical hinge joints (2) with connecting rods (5) achieve rolling and sliding lubrication in the spherical hinge sockets (3); under the sealing action of the spherical hinge joint rubber sleeves (4), the splashing of the grease is prevented.

2. The grease lubrication device for the spherical hinge joint of the disc-type oil-free compressor according to claim 1, characterized in that, The pressure plate includes a movable sealing pressure plate (8) above the grease storage space (9) and a spring pressure plate (11) flush with the top of the swing plate (1), and the preloading spring (6) is connected up and down between the movable sealing pressure plate (8) and the spring pressure plate (11).

3. The grease lubrication device for the ball joint of a swing plate type oil-free compressor according to claim 2 is characterized in that: The movable sealing pressure plate (8) can slide along the inner wall of the swing plate (1) of the grease storage space (9), and the spring pressure plate (11) is fixedly connected with the swing plate (1).

4. The grease lubrication device for the spherical hinge joint of the disc-type oil-free compressor according to claim 2, characterized in that, The preloading spring (6) adopts a circumferentially distributed compression spring group, or an integral compression spring or a leaf spring.

5. The grease lubrication device for the ball joint of a swing plate type oil-free compressor according to claim 1, characterized in that: Grease transport channels (10) are circumferentially distributed in the grease storage space (9), and the grease transport channels (10) are communicated with the spherical hinge joints (2) through small holes (14) at the bottom of the spherical hinge sockets.

6. The grease lubrication device for the spherical hinge joint of the disc-type oil-free compressor according to claim 5, characterized in that, The aperture of the small hole (14) at the bottom of the spherical hinge socket is 2%-10% of the diameter of the spherical hinge socket (3).

7. The grease lubrication device for the spherical hinge joint of the disc-type oil-free compressor according to claim 1, characterized in that, The spherical hinge joints (2) in the spherical hinge sockets (3) are fixed by fixing screws (13) and spherical hinge joint fixers (12); the spherical hinge joints (2), the spherical hinge sockets (3), the bottom of the connecting rods (5), the spherical hinge joint fixers (12) and the fixing screws (13) are all wrapped by the spherical hinge joint rubber sleeves (4).

8. The grease lubrication device for the ball hinge joint of the disc-type oil-free compressor according to claim 7, characterized in that, The spherical hinge joint rubber sleeve (4) is made of rubber or polyurethane material.

9. A grease lubrication method for a grease lubrication device of a ball joint of a swing plate type oil-free compressor according to any one of claims 1 to 8, characterized in that: It includes: Swing plate assembly installation: Install the preloading spring (6) and the grease adding device (7) on the movable sealing pressure plate (8), install the movable sealing pressure plate (8) in the grease storage space (9), install the spring pressure plate (11) on the swing plate (1), and seal and compress the preloading spring (6); Apply grease to the spherical hinge sockets (3), install the spherical hinge joints (2) in the spherical hinge sockets (3), and install the spherical hinge joint fixers (12) on the swing plate (1) with fixing screws (13); Inject part of the grease into the spherical hinge joint rubber sleeve (4), and seal and install it on the swing plate (1) outside the spherical hinge joints (2) with connecting rods (5); Grease filling: The grease adding device (7) gradually injects grease into the grease storage space (9), and the grease is transported to the spherical hinge sockets (3) through the grease transport channels (10) via the small holes (14) at the bottom of the sockets. At the same time, the preloading spring (6) at the upper part of the grease storage space (9) is compressed, and the grease injection is completed after reaching a certain pressure; Compressor operation: After the compressor runs, the ball joint (2) keeps moving. The pre-tightening spring (6) compresses the grease storage space (9) through the movable sealing pressing plate (8) to cause the grease to produce peristaltic transport, and transports the grease to the ball socket (3) and the ball joint (2) through the transport device channel (10) and the small hole (14) at the bottom of the ball socket, so as to maintain continuous lubrication of the ball joint; during the swinging process of the connecting rod (5), the ball joint rubber sleeve (4) can elastically deform to wrap and maintain the seal to prevent the grease from splashing.

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